DLMF:23.11#Ex2 (Q7320)

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DLMF:23.11#Ex2
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    Defining formula
    f 2 ⁢ ( s , τ ) = cos 2 ⁡ ( 1 2 ⁢ s ) 1 - 2 ⁢ e i ⁢ τ ⁢ s ⁢ cos ⁡ s + e 2 ⁢ i ⁢ τ ⁢ s . subscript 𝑓 2 𝑠 𝜏 2 1 2 𝑠 1 2 superscript 𝑒 𝑖 𝜏 𝑠 𝑠 superscript 𝑒 2 𝑖 𝜏 𝑠 {\displaystyle{\displaystyle f_{2}(s,\tau)=\frac{{\cos^{2}}\left(\tfrac{1}{2}s% \right)}{1-2e^{i\tau s}\cos s+e^{2i\tau s}}.}}
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    DLMF:23.11#Ex2
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